Curious about the record
I know it's meant to help any alien civ that finds it learn about us humans and all that. But how would such a record actually be played? I mean, if it was a "typical" LP, the receiving civ has to understand how mechanics, electrics and sound well enough to build a record player, and if they understand all that, they surely know enough about electricity and magnetism to know that there is a boatload of radio signal noise coming from a small blue dot over yonder? Those signals would have arrived well before the Voyager probe showed up.
So maybe the record is sort of an apology for the noise that has been seeping into the ether? A kind of "yeah , sorry about those Alvin Stardust radio broadcasts. Here's a Chuck Berry record. This should be better."